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Bogie Spring Fatigue Damage - A Function of Static Displacement
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English
Abstract
Springs with low static deflection (stiffer springs for a given load) should have a more severe rig test than springs with a higher static deflection.
It was theorized that the alternating to mean strain ratio increases as the spring stiffness for a given load increases. A series of strain measurements were conducted using three different spring stiffnesses for two different bogie load conditions. A total of six different static deflections were measured. The measurements at the truck bogie suspension show a clear trend that the ratio of alternating to mean strain increases as the static deflection decreases. Damage calculations were conducted to compare the relative fatigue damage caused by the road inputs. This data was then used to determine the alternating to mean strain ratio for a 100,000 cycle rig test equivalent to the relative damage caused by road inputs. It was found that the lower the static deflection, the larger this ratio must be.
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Citation
Dudding, A., "Bogie Spring Fatigue Damage - A Function of Static Displacement," SAE Technical Paper 922432, 1992, https://doi.org/10.4271/922432.Also In
References
- SAE Handbook “Parts and Components,” 2 SAE 1992 17.08
- Dowling N. E. Brose W. R. Wilson W. K. “Notched Member Life Predictions by the Local Strain Approach,” Fatigue Under Complex Loading SAE 1977
- Shigley J. E. Mitchell L. D. “Mechanical Engineering Design,” McGraw-Hill Book Company Fourth 1983 286